The Solar System at your Fingertips
Dwarf Planets and Asteroids » 

Asteroid 7 Iris

Available Resources

Asteroid 7 Iris Sky Charts and Coordinates

This is a simplified sky chart, showing where Asteroid 7 Iris is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Asteroid 7 Iris in Taurus on March, 22 2018
High Precision Live Sky Chart
04h 29m 00s
+20° 16’ 14”
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Asteroid 7 Iris Rise and Set Times

Today's Asteroid 7 Iris rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the local timezone Europe/London.

Azimuth: 69.7°
Max altitude: 58.8°
Azimuth: 290.3°

Asteroid 7 Iris Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 7 Iris with respect of the Sun and the orbits of the major planets. The position of Asteroid 7 Iris and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Asteroid 7 Iris Ephemeris

The following table lists the ephemerides of Asteroid 7 Iris computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 7 Iris in our Online Planetarium at the chosen date.

Date MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2018 Mar 15 9.78 04h 14m 04s +19° 52’ 23” Taurus
2018 Mar 16 9.80 04h 16m 11s +19° 56’ 00” Taurus
2018 Mar 17 9.81 04h 18m 20s +19° 59’ 34” Taurus
2018 Mar 18 9.82 04h 20m 26s +20° 03’ 02” Taurus
2018 Mar 19 9.83 04h 22m 35s +20° 06’ 28” Taurus
2018 Mar 20 9.84 04h 24m 42s +20° 09’ 47” Taurus
2018 Mar 21 9.85 04h 26m 52s +20° 13’ 04” Taurus
2018 Mar 22 9.86 04h 29m 00s +20° 16’ 14” Taurus
2018 Mar 23 9.87 04h 31m 09s +20° 19’ 22” Taurus
2018 Mar 24 9.88 04h 33m 20s +20° 22’ 23” Taurus
2018 Mar 25 9.89 04h 35m 29s +20° 25’ 20” Taurus
2018 Mar 26 9.90 04h 37m 39s +20° 28’ 14” Taurus
2018 Mar 27 9.91 04h 39m 50s +20° 31’ 00” Taurus
2018 Mar 28 9.92 04h 42m 00s +20° 33’ 42” Taurus

Distance of Asteroid 7 Iris from Earth

The following chart shows the distance of Asteroid 7 Iris from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of 7 Iris is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Asteroid 7 Iris from Earth between January 2013 and December 2075

Light Curve of Asteroid 7 Iris

The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 7 Iris, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Predicted magnitude of Asteroid 7 Iris between January 2013 and December 2075

Asteroid 7 Iris Physical Data

The following shows the known values of the most important physical parameters of Asteroid 7 Iris. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 199.83 km 0.0157
Sideral Rotation 7.1390 hours 0.2983
Absolute Magnitude 5.51
Geometric Albedo 0.2766

Asteroid 7 Iris Orbital Elements

The following table lists the orbital elements of Asteroid 7 Iris at epoch 22 March 2018 00:00 UTC (JD: 2458200.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.23139769
Orbit inclination i 5.52348979°
Perihelion distance q 1.83359510 AU
274,301,923 km
Aphelion distance Q 2.93765027 AU
439,466,227 km
Semi-major axis a 2.38562269 AU
356,884,075 km
Orbital period period 3.6800 years
1,345.8636 days
Date of perihelion transit Tp 2017-Nov-18 07:20:28
2,458,075.8059 JD
Next perihelion transit 2021-Jul-26 04:04
2,459,421.6695 JD
Argument of perihelion peri 145.30147327177°
Longitude of the ascending node node 259.5623689715°
Mean anomaly M 33.353958002586°
Mean motion n 0.26748624°/day
Closest approach to Earth* 2017-Oct-31
Distance of closest approach* 0.84895471 AU
127,001,816 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2075-Dec-31, with a sampling interval of 1 day.